(typically 4.7kΩ to 10kΩ) is connected between the data line and +5V to maintain the bus in a high state when idle. Radio Side: A shielded cable terminating in a 3.5mm mono plug . The tip is the data line, and the sleeve is the ground. Simplified Wiring Diagram For those using a pre-made USB-to-TTL adapter (like those used for Arduino), the wiring is even simpler: Connect GND: Adapter Ground right arrow 3.5mm Plug Sleeve. Combine Data: Tie Adapter right arrow 3.5mm Plug Tip. Add Protection:
Alternatively , a separate isolated DC-DC converter (e.g., B0505S) can generate a floating 5V for the radio side, eliminating the need to draw power from the radio. icom ci v usb interface schematic top
Let’s expand into a real component-level schematic. This is the found in Icom CI-V interfaces (e.g., the “RA0SMS CI-V” design or the “K8ZTT USB-to-CI-V”): (typically 4
Add a from the combined line to VCC (5V) to ensure the signal stays high when idle. Simplified Wiring Diagram For those using a pre-made